Here's a list of all the bulkhead holes to be drilled. I know it sounds like a lot, but it's a big tank and I've been assured it's not a problem from a strength point of view. All the dimensions are internal diameter:
TANK
Euro-brace: 8 x 1†ID (4 on each side of Euro-brace. Bulkheads should be put in upside down)
Overflow box: 1 x 2†ID (on the last hole, closest to the wall)
2 x 1.5†ID (on the two next holes)
Bottom of tank: 2 x 2†ID (for the two drains going to the closed loop pumps)
8 x 1.5†ID (for the outputs from the two Oceans Motions)
Total number of bulkheads:
8 x 1†ID
10 x 1.5†ID
3 x 2†ID
Total: 21 bulkheads for tank
SUMP
Euro-brace: 2 x 1.5†ID
1 x 2†ID
Back panel of sump:
3 x 1.5†ID (regular drain, emergency drain, and inflow to refugium)
2 x 2†ID (1 for pump and 1 spare, which should be capped)
1 x ??? (for Kent float valve)
Inside of sump: 1 x 1†ID (drain from refugium â€"œ should be capped for now, with water exiting by overflowing the panel, but may be used in the future)
Total number of sump bulkheads:
5 x 1.5†ID
3 x 2†ID
1 x 1†ID
(no bulkhead for float valve)
Total: 9 bulkheads for sump
GRAND TOTAL:
9 x 1†ID
15 x 1.5†ID
6 x 2â€Â
Total: 30 bulkheads
Cheers,
Los